How to confirm RedHat Enterprise Linux version?

Question

I am confused by the fact that  even though I installed RHEL 5.1 from DVD (RedHat/5.1.x86_64), when I issue command:

cat /etc/redhat-release

I got:

Red Hat Enterprise Linux Server release 5.5 (Tikanga)

What does it mean? is that to be a release version or kernel version? Is there any other way to confirm that real version of RHEL?

I have this doubt because there will be certain applications that would depend on this.

Many thanks in advance.

Answer 1

I think that you are running yum upgrade. That will in general update you to a newest minor release.

Your main resources for determining this version are

 /etc/redhat_release and lsb_release -a

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